-ol bbb bbl bbn bbo bbs bbt blb bll bln blo bls blt bnb bnl bnn bno bns bnt bob bol bon boo bos bot bsb bsl bsn bso bss bst btb btl btn bto bts btt lbb lbl lbo lbs lbt llb lll lln llo lls llt lnb lnl lnn lno lns lnt lob lol lon loo los lot lsb lsl lsn lso lss lst ltb ltl lto lts ltt nbb nbl nbn nbo nbs nbt nlb nll nln nlo nls nlt nnb nnl nnn nno nns nnt no- nob nol non noo nos not nsb nsl nsn nso nss nst ntb ntn nto nts ntt ob- obb obl obn obo obs obt olb oll oln olo ols olt on- onb onl onn ono ons ont oo- oob ool oon ooo oos oot os- osb osl osn oso oss ost ot- otb otl otn oto ots ott sbb sbl sbn sbo sbs sbt slb sll sln slo sls slt snb snl snn sno sns snt sob sol son soo sos sot ss- ssb ssl ssn sso sss sst stb stl stn sto sts stt tbb tbl tbn tbo tbs tbt tll tln tlo tls tlt tnb tnl tnn tno tns tnt to- tob tol ton too tos tot tsb tsl tsn tso tss tst ttb ttl ttn tto tts ttt